Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector

Chatrchyan, S.; Adžić, Petar; Đorđević, Miloš; Krpić, D.; Milošević, Jovan; Milenović, Predrag; Reković, Vladimir

doi:10.1007/JHEP08(2011)005

2011

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Аутори

Chatrchyan, S.
Adžić, Petar
Đorđević, Miloš

Krpić, D.
Milošević, Jovan

Milenović, Predrag

Reković, Vladimir

CMS Collaboration (ukupan broj autora: 2210)

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Апстракт

An inclusive search for same-sign top-quark pair production in pp collisions at root s = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb(-1). This analysis is motivated by recent studies of p (p) over bar - GT t (t) over bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t -channel exchange of a massive neutral vector boson (Z). Models with such a Z also predict enhancement of same-sign top-pair production in pp or pp collisions. Limits are set as a function of the Z mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.

Кључне речи:

Hadron-Hadron Scattering

Извор:
Journal of High Energy Physics, 2011, 8

Финансирање / пројекти:

FMSR (Austria), FNRS (Belgium), FWO (Belgium), CNPq (Brazil), CAPES (Brazil), FAPERJ (Brazil), FAPESP (Brazil), MES (Bulgaria), CERN (China), CAS (China), MoST (China), NSFC (China), COLCIEN-CIAS (Colombia), MSES (Croatia), RPF (Cyprus), Academy of Sciences (Estonia), NICPB (Estonia), Academy of Finland, ME (Finland), HIP (Finland), CEA (France), CNRS/IN2P3 (France), BMBF, Germany, DFG (Germany), HGF (Germany), GSRT (Greece), OTKA (Hungary), NKTH (Hungary), DAE (India), DST (India), IPM (Iran), SFI (Ireland), INFN (Italy), NRF (Korea), WCU (Korea), LAS (Lithuania), CINVESTAV (Mexico), CONACYT (Mexico), SEP (Mexico), UASLP-FAI (Mexico), PAEC (Pakistan), SCSR (Poland), FCT (Portugal), JINR (Armenia), JINR (Belarus), JINR (Georgia), JINR (Ukraine), JINR (Uzbekistan), MST (Russia), MAE (Russia), MSTD (Serbia), MICINN (Spain), CPAN (Spain), Swiss Funding Agencies (Switzerland), NSC (Taipei), TUBITAK (Turkey), TAEK (Turkey), STFC (United Kingdom), DOE (USA), NSF (USA)

DOI: 10.1007/JHEP08(2011)005

ISSN: 1029-8479

WoS: 000294901400077

Scopus: 2-s2.0-80053159756

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TY  - JOUR
AU  - Chatrchyan, S.
AU  - Adžić, Petar
AU  - Đorđević, Miloš
AU  - Krpić, D.
AU  - Milošević, Jovan
AU  - Milenović, Predrag
AU  - Reković, Vladimir
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4486
AB  - An inclusive search for same-sign top-quark pair production in pp collisions at root s = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb(-1). This analysis is motivated by recent studies of p (p) over bar - GT t (t) over bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t -channel exchange of a massive neutral vector boson (Z). Models with such a Z also predict enhancement of same-sign top-pair production in pp or pp collisions. Limits are set as a function of the Z mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.
T2  - Journal of High Energy Physics
T1  - Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector
IS  - 8
DO  - 10.1007/JHEP08(2011)005
ER  -

@article{
author = "Chatrchyan, S. and Adžić, Petar and Đorđević, Miloš and Krpić, D. and Milošević, Jovan and Milenović, Predrag and Reković, Vladimir",
year = "2011",
abstract = "An inclusive search for same-sign top-quark pair production in pp collisions at root s = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb(-1). This analysis is motivated by recent studies of p (p) over bar - GT t (t) over bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t -channel exchange of a massive neutral vector boson (Z). Models with such a Z also predict enhancement of same-sign top-pair production in pp or pp collisions. Limits are set as a function of the Z mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.",
journal = "Journal of High Energy Physics",
title = "Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector",
number = "8",
doi = "10.1007/JHEP08(2011)005"
}

Chatrchyan, S., Adžić, P., Đorđević, M., Krpić, D., Milošević, J., Milenović, P.,& Reković, V.. (2011). Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector. in Journal of High Energy Physics(8).
https://doi.org/10.1007/JHEP08(2011)005

Chatrchyan S, Adžić P, Đorđević M, Krpić D, Milošević J, Milenović P, Reković V. Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector. in Journal of High Energy Physics. 2011;(8).
doi:10.1007/JHEP08(2011)005 .

Chatrchyan, S., Adžić, Petar, Đorđević, Miloš, Krpić, D., Milošević, Jovan, Milenović, Predrag, Reković, Vladimir, "Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector" in Journal of High Energy Physics, no. 8 (2011),
https://doi.org/10.1007/JHEP08(2011)005 . .